One more I forgot. I have 2 bikes and I have battery tenders on them. These
things make lots of noise all the way up to 40m.Battery Tender is the brand. I
put timers on them so they operate when I'm not. Fred KB4QZH
-------- Original message --------From: fmoeves <fmoeves@twc.com> Date:
11/26/19 9:26 AM (GMT-05:00) To: topband@contesting.com Subject: Re: Topband:
Computer noise Don't forget lights. I just installed 2 8' 4 bulb t8 lights from
Home Depot. Terrible rfi on 160 Cooper lighting sent me new ones with filters
in them worked great. HD sell commercial lights with no filters. I also have
chokes on everything that enters my PC. And have started using the big 4" and
2.5 chokes with rg-400 at antenna feed points. Really cut down on rfi, noise
and PC lockups. Fred KB4QZH -------- Original message --------From: Artek
Manuals <Manuals@ArtekManuals.com> Date: 11/26/19 8:41 AM (GMT-05:00) To:
topband@contesting.com Subject: Re: Topband: Computer noise Could be coming
from the power supply? Sometimes simple clip on chokes are not enough either. I
have a similar problem here on 20M I have dual (Identical) monitors . One has
an irritating but not debilitating spur on 20 the other doesn't ..If I swap
the monitors the spur follows the monitor. Have tried a handful of ferrites to
no avail so it is likely "radiated" IMO and not conducted.Grumpy DaveNR1DXOn
11/26/2019 6:41 AM, Rodman, David wrote:> A few ideas might be helpful here. I
was at the station over the weekend and found a significant amount of noise
coming from one of two computers in the station. Significant noise S5 at 1820.
One computer runs the cluster and 2m connection. That was clean. The other
handles most of the remote chores and has about 15 USB serial devices attached.
Everything was off, except a battery operated transceiver attached to the
receive antenna feed, the modem for the cable and my router. One can
definitely see that operating the computer, closing windows or plugging in USB
devices causes the modulation on the signal to change, this isolating the
source to the computer alone and possible connections to peripherals (they were
all turned off by the way). I did have few chokes available but attaching them
to the USB wires out of the computer to their various devices made no
improvement. I could get more specific but need to leave for my office now.
Any ideas might be helpful and appreciat> ed.>>> ---> David J Rodman MD>
Assistant Clinical Professor> Department of Ophthalmology> SUNY/Buffalo>>
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